Hiroshima City Hospital, Hiroshima, Japan.
Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima, Japan.
Phys Eng Sci Med. 2024 Sep;47(3):1177-1189. doi: 10.1007/s13246-024-01438-5. Epub 2024 May 16.
This study aims to evaluate the output factors (OPF) of different radiation therapy planning systems (TPSs) using a plastic scintillator detector (PSD). The validation results for determining a practical field size for clinical use were verified. The implemented validation system was an Exradin W2 PSD. The focus was to validate the OPFs of the small irradiation fields of two modeled radiation TPSs using RayStation version 10.0.1 and Monaco version 5.51.10. The linear accelerator used for irradiation was a TrueBeam with three energies: 4, 6, and 10 MV. RayStation calculations showed that when the irradiation field size was reduced from 10 × 10 to 0.5 × 0.5 cm, the results were within 2.0% of the measured values for all energies. Similarly, the values calculated using Monaco were within approximately 2.0% of the measured values for irradiation field sizes between 10 × 10 and 1.5 × 1.5 cm for all beam energies of interest. Thus, PSDs are effective validation tools for OPF calculations in TPS. A TPS modeled with the same source data has different minimum irradiation field sizes that can be calculated. These findings could aid in verification of equipment accuracy for treatment planning requiring highly accurate dose calculations and for third-party evaluation of OPF calculations for TPS.
本研究旨在使用塑料闪烁体探测器（PSD）评估不同放射治疗计划系统（TPS）的输出因子（OPF）。验证了用于确定临床实际射野尺寸的验证结果。所实现的验证系统是 Exradin W2 PSD。重点是使用 RayStation 版本 10.0.1 和 Monaco 版本 5.51.10 验证两个建模的放射治疗 TPS 的小照射野的 OPF。用于照射的直线加速器是具有三种能量的 TrueBeam：4、6 和 10 MV。RayStation 计算表明，当照射野尺寸从 10×10 缩小到 0.5×0.5 cm 时，所有能量的测量值的结果都在 2.0%以内。同样，使用 Monaco 计算的值对于所有感兴趣的光束能量，在 10×10 到 1.5×1.5 cm 之间的照射野尺寸，与测量值的差异约为 2.0%。因此，PSD 是 TPS 中 OPF 计算的有效验证工具。使用相同源数据建模的 TPS 具有不同的最小照射野尺寸，可以进行计算。这些发现有助于验证需要高精度剂量计算的治疗计划设备的准确性，以及第三方对 TPS 的 OPF 计算的评估。
